HiberbootEnabled 0: should you disable Fast Startup in Windows?
Short answer
UpdatedWith Fast Startup, 'Shut down' does not fully shut down: Windows saves the kernel and drivers to disk and reloads them at the next start. HiberbootEnabled set to 0 makes every shutdown a full one. In the registry it sets HiberbootEnabled to 0 under HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Power.
HKLMSYSTEM\
HiberbootEnabledYour previous value0
What it does
With Fast Startup, 'Shut down' does not fully shut down: Windows saves the kernel and drivers to disk and reloads them at the next start. HiberbootEnabled set to 0 makes every shutdown a full one.
In the app the switch is called "Disable Fast Startup", described there as: Makes every shutdown a full one, so driver and tweak changes always load on the next boot.
When it helps, and when it hurts
When it helps
- Driver changes and many tweaks that only load on a real boot. It also clears problems that otherwise survive a shutdown.
When it hurts
- Starting the PC takes a few seconds longer, mostly on hard disks. On an SSD the difference is small.
What it writes
Exactly what the switch changes, read from the app's source. Switching it off is what the app writes when you turn the tweak off again.
| Key and value | With the tweak | Switching it off |
|---|---|---|
| HKLMSYSTEM\ | 0 | Your previous valueSaved before the change, or deleted if there was none.Windows default: 1. |
From the app's source (pack_extra.hpp), app 2.0.0, checked .
The same change by hand
You do not need the app for this one. These commands make the changes from the table above. Run them in a Command Prompt opened as administrator, and make a restore point first.
reg add "HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Power" /v "HiberbootEnabled" /t REG_DWORD /d 0 /freg add "HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Power" /v "HiberbootEnabled" /t REG_DWORD /d 1 /freg query "HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Power" /v "HiberbootEnabled"How to undo it
In the app: Yes
Switching it off puts back exactly what was there before, value for value.
Switch the tweak off in Frozen Tweaks. The app saved what each value was before the change and writes exactly that back, or removes the value if it did not exist.
Changing several settings at once? The app's Make a restore point button, on every plan, makes a Windows restore point before you start.
Verdict
Recommended on any PC with an SSD. It makes 'shut down and start again' mean what it says.
Questions
- What does the "Disable Fast Startup" tweak change in Windows?
- In the registry it sets HiberbootEnabled to 0 under HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Power.
- What is the default value of HiberbootEnabled?
- The Windows default of HiberbootEnabled is 1. Frozen Tweaks sets it to 0, and switching the tweak off puts back the value you had before.
- Is "Disable Fast Startup" safe to switch on?
- Recommended on any PC with an SSD. It makes 'shut down and start again' mean what it says. The main cost: Starting the PC takes a few seconds longer, mostly on hard disks. On an SSD the difference is small.
- How do I undo it?
- Switch the tweak off in Frozen Tweaks. Switching it off puts back exactly what was there before, value for value.
- Is "Disable Fast Startup" free in Frozen Tweaks?
- Yes. It is one of the free tweaks, with no time limit.
In the app
- Switch
- Disable Fast Startup
- Category
- Power
- Plan
- Free
- Undo
- Yes
Related guides
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More tweak explainers
- HibernationHibernation saves the contents of memory to hiberfil.sys on the Windows drive so the PC can power off and resume later. What it changes and how to undo it.2 min read
- High performance power planA power plan decides how quickly Windows lets the processor slow down, park cores and put USB ports and drive links to sleep.2 min read
- USB selective suspendUSB selective suspend lets Windows put a single USB port to sleep when the device on it is idle. What it changes, when it hurts, and how to undo it.2 min read
Written by
Frost LIVEFounder of Frozen Tweaks, based in Hamburg, Germany. Publishes settings guides for competitive games on his YouTube channel, Frost LIVE.
In the app
- Category
- Power
- Plan
- Free
- Undo
- Yes
Frozen Tweaks
Free for Windows 10 and 11
58 tweaks free, each with an undo switch. Never edits game files.
v2.0.0 · 6.4 MB · Windows 10 and 11, 64-bit · free account, no payment details
Or type frozentweaks.com on your PC.
The free Windows app for competitive games.
58 tweaks free, each with an undo switch. Never edits game files.
v2.0.0 · 6.4 MB · Windows 10 and 11, 64-bit · free account, no payment details
Frozen Tweaks runs on Windows. Send the link to your PC and download it there.
Or type frozentweaks.com on your PC.